中文摘要：

为确定露天矿边坡内残煤发生自燃时内部温度分布及燃空区深度,以PFC3D作为模拟平台,借助其热力耦合模型,模拟了氧在裂隙中运动并与煤层反应且相互促进发展的过程,从而得到了边坡内温度场及燃空区发展深度;使用极小颗粒模拟氧气的流动及其与煤的反应,并通过FISH实现该过程。使用该模型模拟的结果表明,氧流通道的形成与煤层自燃是相互促进的,但燃空区的发展应该有一个最大深度。燃空区发展过中边坡内温场分布区域的变化可划分为3个阶段,分别是燃空区深度为60~70 m、70~120 m、120~170 m。海州露天矿边坡的残煤自燃的燃空区深度为165 m,与物探确定的150~200 m的距离相吻合。研究能估计燃空区的深度,从而为判断有残煤自燃情况下的边坡稳定性提供依据。

英文摘要：

The paper is aimed at finding ways to determine the temperature distribution as well as the depth of combustion space area in the slope in the process when the spontaneous combustion of the slope coal residue takes place with the PFC3D as the simulation platform in its thermodynamic coupling model. For the research purpose, we have simulated the early damage fractures on the slope caused by the spontaneous combustion while studying some behaviors such as the oxygen movement in the fractures, the oxygen reaction with the coal, the mutual promotional development between the movement and the reaction in hoping to obtain the temperature field inside the slope and the development depth of combustion space area. The flows of the oxygen and coal reaction are simulated with the tiny particles, and the process was achieved by FISH. The simulation results show that, the formation of the oxygen flow and the coal spontaneous combustion are by nature a process of mutual promotion, though the development of the combustion space area should have its maximum depth. In addition, the temperature change of the field distribution in the slope can be divided into three stages in the development of the combustion space area. The first stage of the space area combustion is done in an area of 60 - 70 m, with its temperature sphere from 300 K to 420 K, with a lot of the crack and sufficient oxygen. The second stage of the spontaneous combustion takes place in an area of 70 -120 m, with＇ the temperature range increasing from 420 K to 480 K, with the fracture reduction as well as the gradual reduction of the oxygen supply. However, the third stage of the combustion is going on in 120 - 170 m, in a temperature range from higher than 420 K to the gradual drop, at which it is difficult for the construction cracks and oxygen scarce to come about. The residual coal spontaneous combustion has been found taking place in a depth of the combustion space area of 165 m on the slope of Haizhou open-pit coal mine, which may go on in accord with t